Switch



' July 4, 1933.

M. H. RHODES SWITCH I Filed Jan. 24, 1931 4 Sheets-Sheet l y 1933- M. H. RHODES 1,916,867

' swmcn Filed Jan. 24, 1931 4 Sheets-Sheet 2 1/7 I I I III 85 2/ 91% 8? 105.

II I I M. H. RHODES July 4, 1933.

SWITCH Filed Jan. 24, 1931 4 Sheets-Sheet 3 may??? y 1933- M. H. RHODES 1,916,867

I SWITCH Filed Jan. 24, 1931 4 Sheets-Sheet 4 Patented Jul 4, 1933 UNITED STATES PATENT: OFFICE MARCUS H; RHODES, OF NEW HAVEHfCON NECTICUT, ABSIGNOB TO M'- H. BEODB, ma,

' OF NEW HAVEN, CONNECTICUT, A C BPOBIATION 0F DELAWABI SWITCH 'Appllcetfon' filed January 24,1981. Serial No. 519.52%.

This invention relates to electric switches, and with regard to certain mores cific features, to timed delayed action switches.

Among the several objects of the invention may be noted the revision of an electric switch having an ad ustable delayed contactmeking action and e separately adjustable delayed contact-breakingection; the provi-=.

sion of a switch of the class described; which may optionally have either of the delay feetuies temporarily thrown out of operation to permit nonieley action end the provision of a, switch of the class described; which is rugged and which has improved wearing emi operetin qualities. Other objects will be in pert o vious and-in pert pointed out heiematter.

The dra/wiega the accompanying irswiogs, in whic'i is illustrete& one of various possible emhosliments of the invention,

l. is a. front elevation of a switch em hodying the invention;

g.-2 is in side elevation. of the switch of 3 is 2 plan YIB'W of? a support ng piete; g. 41s horizontal. cross section i 5- is e emioel cross section line 5-5 of 6 is ideal section taken elong 66 or g. 5

is a frementery cross section alon line 7*? Fig. 5;

.Z 1 z. semis: m

vertical section lTO L11 ing the manner is mounted; Y

Fig. M is a. fragmentary horizontal section taken on line MM- of Fig. 12, illustrating en escapement mechanism; and,

Fig. 15 is e, fmgmenterysection taken on lines 15-15 oi Figs. 12 and 14.

Similsr reference characters infieate cor respondin arts throughout the severel views of tie i'ewings.

Tile invention in gamed which e mein spring is Referring now more pesticeierly to Figs. 1 end; 2,-numei'el 1 indicates s flush fees plete of the type in generel use for wail mounting of electrical switches. A. central opening.

3 permits it contsolhencile 5 of e switch 7' to extenol Olll3W8 ll to en evsilehle menipulet ing position. Screws g hole. the face pie-to l. to the switch '2'.

it. seconol opening 2 in permits 52 lmusleel wheel. through plate. A. i.

the psogeet opening;

6 likewise permits an mijustsleie plunges e to extenti wheel. eml the 8 tnient oi? the time which electrics eoenections Will he insole broken, es wi l. more fully hereineftee.

lficses or poiiiaess 10 :1 '2 1.". f; m- 1: f! 'i are provioeo on lees lees i. 1.6: moi" eating, by relation to sui s e on the "wheel and plunger 8 the Will-26h. con sections will he metle e110; the exterior the se ch the fees nlets screws 9 switch housing 33 es. tesn'iinels i5 1.? mo. he housing 13 is prefeeebl in. .ileting iiieteiaiel in ieolie comiensetion etluct} or we housing L3? is helti o ll. by 119 (see Figs. 4 end. 5}].

The mounting plate 11 is in. oleteii in Fig. 3. B; will lie? seen that it comprises e long ireletively marrow vesticsi por tion 12: having sidewsfl portions 21 ens 28 extening at right so. les from the geneirel plane of the plate. t centselopeeing l4;-

perniits the passage, of the switch lisnilefi. I

. and 6). On the pin 89 is rotatably mounted assembly as a whole rotates. freely on the pin 89.

The assembly 91 comprises an anvil piece I 93, a cam 103, and a contactor bar 95, to'

gether with suitable s acin washers, all mounted on a sleeve 97 t roug which passes the pin 89. The anvil piece 93, preferably formed of insulating material, includes a notch 99 which engages the hammer portion 69 of the hammer saddle (see Fig. 5). .The oontactor bar 95 comprises a pair of springmetal strips 101 shaped to engage and engage, by rotation on the pin 89,.the knifeedge contacting strips 83 and 85. Therelative shape of the bar 95 and the spacing'of the contacting strips 83 and 85 Will be apparent from Fig. 5.

Mounted on the back of the housing 13 by means of a rivet or the like 107 is a leaf spring 105 which reacts on the cam 103 (see Fig. 5) to cause the contactor assembly 91 to rotate on the pin 89 in a counter-clockwise direction. I,

As the hammer saddle 65 snaps from its Fig. 5 position to its Fig. 8 position, as described hereinhefore, it disengages from the notch 99 in the anvil piece 93 and the action of the leaf-spring 105 on a earn 103 causes the contactor her 95 to rotate into contact with the terminal. pieces 83 and 35, thereby electrically connecting the terminals 15 and 17, provided no obstruction is presented for the rotation of the contactor her 95. {The time controlling means, as will he described here inafter, in operation intercepts or has a latching eiiect upon the coi'itactor bar 95 and temscribed hereinafter, in. operation, alsoi nten cepts or has a latching eii ct upon the hammer saddle 65 and temporarily prevents it irorn'swinging to the the present no istc means is interpo:ecl, the hammer saddie 65 in swingingto the right engages the notch 99 in the anvil piece 93 and rotates the assembly 91 in a clockwise direction on the pin 89, consequently causing the contactor bar 95 to rotate out of contact with the terminal pieces 93 and 85, thereby to hrealr the electrical connections. It is to he understood that the force on the hammer saddle 65 occasioned hy over-centering the compression spring 51 is suficiently great to overcome the counter force caused dls- I at.) Assuming for by the pressure of the leaf-spring on the cam103.. i

present that no time-controlled latching means is in operation, that making and breaking'of'an electricaliconnection between terminals 15 and 17 is efiected in a sudden, snapacting manner by'a simple movement of the switch control handle 5. r 7

Time controlling mechanism The time controlling mechanism is illustrated generally in Figs. 4 and 12.

It is accordingly seen, considering for the Referring now more particularly to Fig. I

12, it will be seen that the knurled wheel 4- is mounted on a main shaft 109, which is in turn supported in a pair of plates 111 and 113. The plates 111 and 113 are substantial- I ly the same shape as plate 25, described hereinbefore in connection with the switch construction. The plates 111 and 113 are supported on the plate 25 in spaced relation by I means of spacing collars 115 screws 117 (see Fig. 5).

Mounted on the main shaft 109 in such a manner asto react against the relatively sta-.

tionary plate lll is a main spring. 119. The manner of mounting the main spring 119 is illustrated more in detail in Fig. 13, where it will he seen that one end of said spring passes around and hooks upon an ear 121 struck from the plate 111, while the other end of said spring 119 is hooked over a projection 123 formed on the main shaft 109. A. pair of cars 125, likewise struck from the plate 111, serve to hold the main spring 119 in coiled form.

in order to prevent the main spring 119 from releasing sidewardly, and in order to provide additional protection against the protecting cover 12'? is provided on the main shaft 109 (see Fig. 12). The knurled wheel 1 and the main spring cover 127 are prevented from rotating on'the main shaft 109 because they are formed so as to engage a flattened poirtion 129 on the main shaft 109 (see Fig. 13,.

y it will accordingly be seen that turning of the knurled wheel 1- winds up the main spring 119, thereby occasioning a reverse torque on the main shaft 109.

An escapeinent'niechanism is provided to permit the torque so produced in'the main spring 119 to expend itself by rotating the main shaft 109 only at a predetermined rate of speed. T his escapernent is'shown in Figs. 11 and 12. A large gear 131 is mounted loosely on the main shaft 109. A friction dish 133 is mounted in a non-rotatable manner on the main shaft 109 in uxtaposition to the large gear 131, in such a manner that the shaft 109 may turn, when winding up the (see Fig. 4) and 1 main spring 119 uncoiling, a main spring main spring 119, without rotating the large der the torque of the spring 119. So advancing, the leadin edge of the tooth 173 engages and rotates t e pm 169 against the to no of the hair ring 161, and the action (if! t e tooth 171 is t us repeated by the tooth In such a manner the balance wheel 153 and its attached parts serve to ermit only timed, intermittent motion of t e sprocket wheel'151, and, through the gear train 147, 145,141, 139, 135,131 the main shaft 109. By reason of the reduction effect of the gear train,-as described hereinbefore, the main shaft 109 is accordingly permitted to rotate at only a ver slow speed, and the main spring 119, a ter being wound up, thus unwinds only very slowly.

The main shaft 109 extends through the "plate 113 into the space between plates 113 and 25, and has immovably mounted on the end' thereof a gear 175 (see Fig.. 10). The gear 17 5 meshes with a gear 177, mounted on a shaft 179 which is supported in the plates 25 and 113. The shaft 179 extends through the plate 25 as will appear hereinafter. In the same plane as the gears 175 and 177 is provided a latch lever 181, which is itself rotatably supported on a pin 183 borne in the plates 25 and 113. An ear 185 struck from the plate 113 limits upward movement of the lever 181, while a leaf spring 187 serves to hold said lever normally against said ear 185. A projection 189 is formed at right angles to t e plane of the lever 181 and at the outer end thereof. The projection 189 passes through a suitable slot 191 (see Fig. 5) in the plate 25, and functions asa latch for the hammer saddle 65.

The lever 181 is also formed with a slopin upper surface 193, designed to function as a cam to depress the lever 181 on its shaft, and consequently to depress the projection 189,

as a special long tooth 195 on the gear 177 rotates into contact therewith.

As indicated hereinbefore, the shaft 179 extends through the fptlate 25 (see Fig. 5). On the end of the sha 179 beyond the plate 25 are mounted'a gear or pinion 196 and a friction disc 197 (see Figs 5 and 12). The

gear 196 is loose on the shaft 17 9 but the disc.

197 is tight. From a functional standpoint, thegear 196 and disc 197 are similar. in operation to the gear 131 and disc 133; that is, rotation of the shaft 179 causes rotation of the gear 196, through the friction disc 197, but rotation of the gear 196 from the exterior does not occasion rotation of the shaft17 9.

Meshing with the gear 196 is a gear 199' by an ear 209 struckfrom the plate 25, and

is normally held' against said ear 209 by a leaf spring 211.

Extend ng from the lower end of the lever 205 is a pro ection 213. The projection 213, in its normal position (with the lever, 205 against the ear 209), is in the line of downward rotation of an ear 215 formed on the side of the connectin bar 101, thereby serving' as a latch for said connecting bar asindicated hereinbefore. projection 213 is slopedas at numeral 217 so that the ear 215, upon upward motion, pushes said projection aside and no latching efi'ect is had on the connecting. bar 101.

v In its rotation with the gear 199, the long tooth 201engages the upper end of the lever 205 nd pushes said lever aside, whereby the pro ection 213 is removed from the line of motion of the car 215 on the connecting bar 101, thus unlatching said bar.

, Adjustment of the angular position of the The lower side of the long tooth 201 of the gear 199 is provided for by means of a rack 219 formed on the edge of theplunger 8, and meshing with said car 199. The plunger 8 is adjustably hel on The main shaft 109 by reason of the frictional engagement between the gear 196 and the friction disc 197. It is to be understood,

however, that rotation of the main shaft 109 occasions rotation of the gear 199, re-

gardless of the separate rotatability of the gear 199 by itself. It is thus seen that a time-controlled mechanismis provided which presents tWo controllable latches for the mechanical switch per se: a latch'for the hammer saddle 65 and a separately controlled latch for the connector bar 101. The interrelation of these parts will now be described.

Operation The conditions of operation of the switch described above are as follows:

(a) It is desired to operate the switch as an ordinary switch, without the interposition of time factors'for either the making or breaking of the connection.

(b) it is desired to operate the switch to make connection after a definite time has elapsed from the time ofthrowing the manually controlled handle to UN osition, without any definite time for bre 'ng the connection. 1 1

(o) It is desired to operate the switch operating respectively on the hammer sad-n e 55 contacting her 95, are, for or inary operation, moved into inoperative positionsin the following manner:

Rotating of the knurled wheel 1 in a direction such that the magnitude of the indicia thereon is decreasing (clockwise rotation in Fig. 10) ultimately, when the indicia reach a zero value, turns the gear 177 so that the long tooth 195 engages the sloping surface 193 of the lever 181, and presses said lever 181 downwardly. The projection or latch 189, being a part of the lever 181, is concurrently pressed downwardlzy in its slot 191 and is thus removed from e path of the hammer saddle 65. If the wheel 4 is left at its zero position, the latch 189 is thus held out of operating position with respect to the hammer saddle 65.

Pulling or withdrawing the plunger 8 so that the ma itude of the indicia thereon is decreasing moving said plunger upwardly in Fig. 5) similarly rotates the gear 199 in .such a manner that, when the value of the indicia reaches zero? onthe face plate 1, the long tooth 201 presses against the upper end of the lever 205, thus swinging the lower end of said lever 205 and the projection or latch 213 thereon to the right and carrying said latch out of the line of motion of the projection 215 on the contacting bar 95. If the plunger 8 is left at its zero position,

the contacting bar is permittedto rotate without interception hy the latch 213.

With latches 189 and 213 so removed from operating position, movement of the control handle 5 to @N position permits the leaf spring 105 to snap the contacting oar 95 in1- mediately into contacting position with the lnai pieces 95 77. Similarly, more er of control handle 5 from UN to s th s g g r 8 is dept-cs.

pointer 10 on the face plate 1 indicates the index corresponding to the length or extent time predetermined as the interval desired hefore connection is to be made. It will be seen that toy depressingsthe plunger 8 in such a manner the gear 199 is rotated. to carry the long tooth 201 away from the lever 205 to an extent determined by the extent of depression of said plunger 8. With the tooth 201 disengaged from the lever 205, said lever 205, under the influence of the spring 211, returns to normal position against the ear 209, thus bringing the latch 213 into the path of the projection 215 on the contacting bar 95.

The knurled wheel 4 is now rotated until the index figure indicated by the pointer 10 is equal to, or greater than, the index in effeet on the plunger 8. Turning of the wheel 4 serves to wind up the main spring 119, and accordingly places a reverse torque (reverse to the manual rotation direction of the wheel '4) upon the main shaft 109, and the large thus removing the latch 213 from the path Simultaneously with the setting of the knurled wheel 4, the switch control handle 5 is thrown to its ON position. This movement causes the hammer saddle to rotate out of contact with the anvil piece 93, and the leat spring 105, acting on the cam 103, throws the contacting bar in the direction of making contact with the terminals and 77. However, the latch 213 is in the path of the projection 215 on said contacting bar 95, and upon engagement of said latch and said pro- .jection, the contacting bar is intercepted in its motion and prevented from completing contact. The switch in this condition is illustrated in Fig. 8.

Ultimately, as described hereinbefore, the long tooth 201 engages the lever 205 to remove the latch 213 from engagement with the projection 215, and when such action occurs, the contacting bar 95, empowered by the leaf spring 105, snaps to a connecting position between the terminals 75 and 77, as shown in Fig. 9.

In such a manner is contact established a predetermined extent of time after the switch handle 5 is thrown.

It is to be noted that the knurled wheel 4 should .be turned to a value at least equal to the setting of a plunger 8, otherwise the main spring 119 will not be wound sufficiently to turn the gear 199 far enough to release the latch 213.

After connection has thus been established, it may in general be broken simply by moving the control handle 5 to OFF position. This is true in all cases where the time set on the knurled wheel 4 is .equal to the time set on the plunger 8, and is also true if the set of the knurled wheel 4 is in excess of the set of the plunger 8, and the excess amount'of time has passed. If the knurled wheel 4 has been set to a time value greater than the setting of the plunger 8, it is necessary, in order to break connections, that either 1) the excess he allowed to elapse, or (2) the knurled wheel 4 be manually returned to zero position, after either of which a simple motion of the handle 5 to OFF position is adequate to effect a disconnection. This attendant action of the knurled wheel 4 will be apparent with the description of the remaining two methods of operation hereinafter.

Future break operation For future break operation, as defined I hereinbefore, the latch 189 is operative while the'latch 213 is held in an inoperative posi- 4 and the plunger 8 are both at their respective zero positions. Throughout the future break operation the plunger 8 remains in zero position, so that the latch 213 is ineffective and the contacting bar 95 is at all times free to rotate in an unobstructed manner. I

The handle 5 is now thrown to ON position, whereby contact is immediately made as described hereinb'efore.

The knurled wheel 4 is next rotated until the pointer 10 indicates the index corresponding to the extent of time it is desired to allow to pass before contact is broken. Rotation of the wheel 4 effects two actions, namely, (1) the main spring 119 is wound and the escapement mechanism set in operation as. described hereinbefore, and (2) the long tooth 195,-by reason of the rotation of the gear 177 (through the gear 175) is rotated away from engagement with the surface 193 of the lever 181, thus permitting said lever 181 to return, under action of the spring 187, to its normal position against the ear 185,

thereby carrying the latch or projection 189 into operative position intercepting the path of motion of the hammer saddle 65.

It is to be noted at this point that the operation of throwing the control handle 5 from OFF to ONposi tion-may be made subse quently to, as well as prior to. the setting of the knurled wheel 4. This is because the latch 189 is ineffective as against motion of the'hamme-r saddle 65 from right to left as in Fig. 5. (The sloping rear edge of the hammer saddle 65 pushes the latch 189 downwardly against the spring 187 and out of the way, regardless of the position of the long tooth 195.)

After contact has been made and the wheel 4 hasbeen set, regardless of the respective order in which these two operations have taken place, the control handle 5 is returned from ON to OFF position, with the result that the compression spring '51 is overcentered and pressure is brought to bear on the hammer saddle 65 tending to throw it back to the right, that is to the Fig. 5 position. The hammer saddle 65 is, however, prevented from moving by reason of its engagement with the latch 189. The general position of the various elements at this stage (excepting the contacting bar latch 213 and its plunger 8) is indicated in Fig. 9.

Meanwhile, the escapement mechanism has been set into operation and the main shaft 109 is slowly turning back to normal position empowered by the unwinding main spring 119. As the predetermined period of time draws near completion, the long tooth 195 returns to engage with the lever 181 and push said lever downwardly. The latch 189 is thus slowly pushed downwardly, and at the expiration of the predetermined interval of time, it moves entirely out of the path of the hammer saddle 65, and said hammer saddle 65, under the force of the compression spring 51, snaps-to the right, engaging the anvil piece 93 and rotating the contacting bar 95 into disconnected position, thus breaking the electrical contact.

It is to be noted that the gear 196, and the gear 199 meshing therewith, remain stationary throughout the period of this future break operation by reason of the frictional engagement of the friction disc 197 and said gear 196.

Future make and break operation operation, with the handle 5 at OFF and the wheel 4 and plunger 8 at their respective zero positions.

First, the plunger 8 is set, as in future make operation, to indicate the interval 'de sired to elapse before it is desired that connections be made. Simultaneously, the wheel 4 is set to indicate the interval, considered from the instant of setting, desired to elapse before connections are broken. It is apparent that the setting of the wheel 4 will be greater than that of the plunger 8,

the difference representing the interval during which electrical connections are made.

With the setting of both wheel 4 and plunger 8, it will be seen that both latches 189 and 213 are moved to operative positions. The actionis at this point aggregatively those of the fufiar'e make operation and the future break operation combined.

With both latches in operative position, the control handle 5 is moved, first to ON position (Fig. 8) and then substantially at once back to OFF position. This occasions the following movements: First, the hammer saddle is thrown to the left, where it is caught by the latch 189. Second, with the, withdrawal of the hammer saddle 65, the leaf spring 105 reacts on the earn 103 to force the contacting bar 95 towards contacting position, but it is arrested before contact is made by the latch 213. Third, with the return of the control handle 5 to OFF position, the compression spring 51 reacts on the hammer saddle 65 placing thereon a force back to the right; the hammer saddle does not move, however, because of the interposed latch 189.

213 and allowed the contacting bar 95 to snap to contacting position across the terminals and 77. At this stage, the elements of the switch arearranged as in Fig. 9. The main spring 119 has not, however, returned completely to its zero or normal position,

It is thus seen how the present invention is constructed as well as the manner of its operation under several different conditions.

Variations It is to be understood that the various elements, especially the gear trains and escapement mechanism, may be varied in size and arrangement so that the indicia on the wheel 4 and plunger 8 represent, any suitable intervals of time, for example, hours, minutes, or seconds. Further, it is to be understood rom operating posithat, under conditions such as for the systematized control of chemical or bacteriological processes, the adjustability feature may be dispensed with. and the wheel 4 and plunger 8 or their equivalents provided with suitable stops to control their settings at predetermined values for each cycle of operations.

. Furthermore, it is to be understood that the face plate 1 and housing 13 may equally well be replaced with other cofunctional means, whereby the switch is adapted for other than wall operation, such as, for example, a portable desk or panel mounting encasement.

In view of the above, it will be seen that the several'objects of the invention are achieved and other advantageous results obtained.

As many changes could be made in carrying out the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

I claim:

1. A time delay switch comprising a control handle, means for effecting electrical connections, and atime delay mechanism, said time delay mechanism including latching means, said latching means cooperating with said handle and said means to control the time of making contact and the time of breaking contact and separate adjusting means for each of said latches whereby said latches may be adjusted independently of said time delay mechanism, said adjusting means also being tive position, whereby said switch is conditioned for non-time delay operation, and willremain indefinitely at rest in either circuitmaking or circuit-breaking position.

2. In a time-delayed switch, means for controlling the time of making and breaking contacts comprising a time escapement mechanism and at least two latches controlled by said escapement mechanism, and means for independently adjusting said latches, said adjusting means also being adapted to remove said latches from operative position, whereby said switch is conditioned for non-time delay operation, and will remain indefinitely at rest in either circuitmaking or circuit-breaking position.

3. In a time-controlled electrical switch, a control handle, a contactor bar, a pair of terminal pieces adapted to be connected by said contactor bar, a hammer saddle on said control handle, and an over-centering spring reacting between said hammer saddle and said. control handle, said hammer saddle engaging said contactor bar whereby, by motion of said control handle, said contactor bar is thrown into and out of electrical contact with said terminal pieces, a timing mechanism, alatch associated with said timing mechanism and controlled thereby, said latch being adapted to project into the path of said contactor bar to prevent said'contactor bar from connecting said terminal pieces until said latch is removed by said timing mechanism, and'a second latch also associated with said timing mechanism and also controlled thereby, said second latch "being adapted to project into the path of said hammer saddle to prevent said hammer saddle from removing said contactor bar from contact with said terminals until said second latch is removed by said timing mechanism.

4; In a time-controlled electrical switch, a

control handle, a contactor bar, a pair of terminal pieces adapted to be connected by said contactor bar, a hammer saddle on said control handle, and an over-centering spring reacting between said hammer saddle and said control handle, said hammer saddle engaging said contactor bar whereby, by motion of said control handle, saidcontactor bar is thrown into and out of electrical contact with said terminal pieces, a'timing mechanism, a. latch associatedwith said timing mechanism and controlled thereby, said latch being adapted to project intothe path of.

said contactor bar to prevent said contactor bar from connecting said terminal pieces until said latch is removed by-said timing mechanism, and a second latch also associated with said timing mechanism and also controlled thereby, said second latch being adapted to pro ect into the path of said hammer saddle to prevent said hammer saddle from removin said contactor bar from conating to remove said latches separately from of predetermined time intervals.

6. :A switch as set forth .in claim 5, further characterized in that the first-named latch is operative to prevent movement of said con their operative positions upon the expiration tactor bar only as said contactor bar moves to connect said terminals.

7. A switch as set forth in claim 5, further I I characterized in that the second-named latch is operative to prevent operation of said overcentering means only when said over-centering means moves to disconnect said contactor bar from said terminals.

, 8. A switch as set forth in claim 5, including separate adjusting means for each of said latches, whereby the predetermined'time intervals associated with said latches may be independently varied.

9. A switch as set forth in claim 5, including separate adjusting means for each of said latches, whereby the predetermined time intervals associated with said latches may be independently varied, one of said adjusting means being connected to said timing means in such manner that manipulation of such adjusting means empowers the timing means for action. I

10. In a time-controlled switch having a plurality of operative phases, including circuit-making and circuit-breaking phases, a movable contactor bar and terminals positioned to be engaged by said contactor bar, a I

spring at all times urging said contactor bar into one operative phase, a time-controlled latch operative to prevent said contactor bar from moving under influence of said spring,

an actuating mechanism including a second spring more powerful than said first spring, and means for positioning said actuatin mechanism in operative relationship to sai contactor bar when in said one operative phase, whereupon said actuating means, im-

pelled by said second spring, forces said contactor bar against-the reaction of said first spring, into a second operative phase.

11. Acswitch as set forth in claim 10, 1ncluding a second time-controlled latch, said second latch being operative to prevent said ectueiing means from forcing seid coniecior bar into said second opereiisle pliese,

12. A switch as set forth incleim iiiclnding e second time-controlled leech, ssid second leech bein operative to prevent said actuating means rom forcing said coniector losr into said second opereiive pliese, end including 9. single inning train operating both of said leeches 13. A switch as set fiorili claim 10 incinding s second isime-confnnolled lei-ch, said second leech being operative so pcevenl; seid actuating nieens from forcing coniecl'lor into said second operative g: e *brein. operesing bci" leeches sepereie edjnsiing me i fidueliy deiyemiininc the time si 1163i of said leeches slieii ceese to be pe M. lin ibime-controlied swi nreiiiy of operesive 'o uit-making end circninbre l, OVEliJlQ conieccor ism sic incls posiitioned to engsged by said coniecsoi' leer, meclienicei eciaueining essocieted Wicii seid contecfscr s time J ems; e pair of leeches "iees'ia one o seid leeches being sec Jenuery, 193i.

emcee? which both of said latches comprise levers hevin fulcrums, and projections, one on one end oi each lever, extending into operative positions, seid levers being actuated by proeciing means associated with said timing 12min,

16. in s, time-controlled switch, a pair of leizches for preventing making and breaking of electrical connections for predetermined iime inierveis, an escepemeni train having e resin shsfi, end a pain of gear trains driven from seid main shaft, the lest gear of each train, respectively, controlling; the -position of one of said letclies.

ii. In a aims-controlled switch, a pair of isisches for preventing making end breekof eleciricei connections for predeier-- mined intervals, escepemene irein iievingg e main shaft, end peir gear sins driven from said main chefs, the lesi; of eecli train, respectively, controlling else posifiicn of one of said leiches, and means i predetermininp; the time at which the said eches are moved, seid means comprising, or one :ifilllsh, means for adjusting the posion oi seid main slisxfi, end the second cli, meens operating directly upon the respeciive gear train essociesed with said latch,

18. A switch set forth in claim 1?, in which the main shaft adjusting meens elso serves to empower said escepemene farein.

testimony whereof, I have signed my name so this specificstion skis 29in dey of 

